Unable to clear date on tasks with Predecessors and without Successors (but also on tasks with Successors and without Predecessors)

Unable to clear date on tasks with Predecessors and without Successors (but also on tasks with Successors and without Predecessors)

Hello,

I've set several dependencies for my tasks, and assigned due dates to them.

Now, when I try to clear the due date for all tasks, I always get a "Dates cannot be cleared as it has dependent task).

This is happening also when I try clear due date for tasks with no successors or with no predecessors.

Why is this happening? How can I clear the dates without having to create all the tasks again?

Thank you